Merge pull request chvin#29 from 0xflotus/patch-3

fixed rootReducers.js in comments

Author: chvin

README.md

@@ -127,7 +127,7 @@ Immutable学习资料：
 关键的库：[gajus/redux-immutable](https://github.com/gajus/redux-immutable)
 将原来 Redux提供的combineReducers改由上面的库提供：
 ``` JavaScript
-// rootReduers.js
+// rootReducers.js
 // import { combineReducers } from 'redux'; // 旧的方法
 import { combineReducers } from 'redux-immutable'; // 新的方法